
Teledyne API Ultrafine Particle Monitor - Model 651APPENDIX A Firmware Commands
RRD – Read Data Record
RRD returns the current data values in the “D” record format. Data records are collected according to the time period you have specified for the data collection interval.
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| RRD |
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| Command |
| RRD |
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| Response |
| D record (see below) |
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| D |
| Record identifier |
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| Date |
| Date in yyyy/mm/dd format |
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| Time |
| Time in hh:mm:ss format |
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| Flags |
| Status Flags (see information in RIE command | |||||
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| description) |
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| Conc |
| Aggregated concentration calculated by dividing | |||||
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| the accumulated aggregate counts by the live- | |||||
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| time of the sample flow rate (2 cm3/sec). The | |||||
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| aggregated counts and |
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| accumulated each 1/10th second interval. The | |||||
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| overflow flag is set when the concentration value | |||||
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| exceeds the maximum specified concentration. | |||||
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| AT |
| Elapsed sample time 0.1 sec resolution (0.1 to | |||||
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| 3600) |
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| LT |
| Live time 0.001 sec resolution (0.001 to 3600) | |||||
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| CNT |
| Accumulated particle counts |
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| Photo |
| Average photodetector value in mV |
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| Reserved |
| Blank reserved space |
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| PH |
| Average pulse height in mV |
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| PSTD |
| Pulse height standard deviation |
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| Example D Record: |
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| D,2012/11/2,08:01:21,0,1.04e4,6.0,4.4,769424,140,,0,0 |
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Record Type | Date |
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| Conc |
| AT | LT | CNT | Photo | PH | PSTD | |
D | 2012/11/2 |
| 08:01:21 | 0 |
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| 1.04e4 |
| 6.0 | 4.4 | 769424 | 140 | 0 | 0 |
07506C DCN6727 |